At this conference (Annual Meeting for Economic Botany), I learned about iconography, and how it can inform us how about the use of plants in past cultures.
Live plants in Raleigh.
We had a fun side trip - only slightly getting lost. We have come to the conclusion that North Carolina does not feel the needs for signs, as we saw no signs for either Duke University or the State Capitol. Luckily, we were, eventually, able to find both.